Belt disengaging device



June 28, 1949. R. M. BARTH 2,474,457 7 BELT 'DISENGAGING DEVICE Filed May 16, 1947 v INVENTOR R085- nemwwa 8ART/l ATTORNEYS Patented June 28, 1949 BELT DISENGAGING DEVICE Robert Menning Barth, Bronxville, N. Y., assignor to The FR Corporation, New York, N. Y., a corporation of New York Application May 16, 1947, Serial No. 748,585

7 Claims.

- My invention relates generally to a belt dis engaging device or clutch mechanism, and in particular it relates to a belt disengaging device for use in belt-actuated power transmitting devices. While my invention has many uses and applications, and will be described generally hereinbelow, it is particularly useful in rewind devices for motion picture film operation. It is to be understood, of course, that my invention is to be limited only by the scope of the claims annexed hereto.

I The main object of my invention is the provision, in a device having a drive pulley and a driven pulley and an endless belt connection between the two, of means for automatically disengaging the belt from the driven pulley on the reversal of drive direction.

Another object of my invention is the provision,

in a device having a drive shaft and pulley thereon and a driven shaft and pulley thereon and an endless belt connection between the pulleys, of means normally spring urged against the drive pulley to disengage automatically the belt from the drive pulley on reversal of drive direction.

Another object of my invention is the provision, in a device having a drive shaft and pulley thereon and a driven shaft and pulley thereon and an endless belt connection between the two, a disc on the drive shaft and means to spring-urge same normally against and in friction engagement with the drive pulley, the disc being operable on reversal of the direction of drive shaft to disengage the belt from the drive pulley.

Another object of my invention is the provision of a disc in a device as above described of a pair of spaced wing members on the disc having idler rollers thereon normally engaging the belt between the drive pulley and the driven pulley, the said idler rollers distending the belt on reversal of drive direction to disengage same from the drive pulley.

Other and further objects of my invention will in part be obvious and still others specifically recited in the following description of an illustrative embodiment thereof.

In the drawings annexed hereto and forming a part hereof,

Figure 1 is an elevational view of one form of device constructed according to and embodying my invention, with the parts shown in engaged position;

Fig. 2 is a similar view thereof, with the driven shaft shown in disengaged position; and

Fig. 3 is a section on the line 33 of Fig. 1.

My device comprises a support member 3 on which is mounted a drive shaft ID on which 1s fixed, for rotation therewith, a peripherally notched pulley wheel l2, as by means of set screw [4 or otherwise. A flat circular disc I 6 is threaded on shaft I0 adjacent pulley Wheel I2. Disc I6 is not fixed onto or otherwise rotatable with wheel l2 except as will be described below. A pair of wing portions I8, 20 are formed on disc I6, extending outwardly therefrom and spaced apart about of the disc. It will be seen that the linear distance between wings I 8, 20 is greater than the diameter of drive pulley l2. Each wing has a pin 22, 22 fixed thereon and extending outwardly therefrom, on which pins idler rollers as 24, 24 are mounted, as by cotter pins 26, 26 or otherwise. Rollers 24, 24 are also peripherally grooved, and are mounted on shafts or pins 22, 22 as to rotate in the same plane as wheel l2. A spring washer 30 is mounted on shaft Ill in a suitable socket 3| secured on shaft ID as by set screw 32, the spring normally bearing and exerting pressure on disc l6 as to urge it towards and against pulley wheel [2.

A driven shaft as 40 is also mounted on support B, having a driven pulley wheel 42 fixed on said shaft 40 for rotation therewith, as by means of a set screw 44 or otherwise. Wheel 42 is also peripherally grooved and is aligned with drive pulley wheel l2 and the idler rollers 24, 24. An endless belt of extensible material as leather, rubber, composition material, coiled spring, etc. is mounted about the drive and driven pulley wheels I2, 42 and also about the idler rollers 24, 24.

, Support structure B is provided with a pair of vertically spaced apart pins 50, 52 projecting outwardly therefrom in'the path of wing portions I8, 20. Referring to Figs. 1 and 2, it will be seen that pins 50, 52 are radially arranged with respect to the center of disc' l6, and mounted slightly beyond the perimeter thereof but within the arc describably by wings I8, 20 during rotation of disc 16. Both pins 50, 52 are on the same side of the structure with respect to drive shaft [0.

In operation, when drive shaft l0 and driving wheel l2 are rotated clockwisely, manually or otherwise, the friction engagement between disc l6 and driving wheel I2 caused by the normal biasing of spring 30 urging disc l6 against wheel l2, will result in rotating disc I6 clockwisely. This rotation of disc l6 will continue until the leading edge [1 of wing I8 abuts against stop-pin 50, thus positioning idler rollers 24, 24 between the drive and driven pulley wheels (as in the position of Figure 1), and directly and positively transmitting rotative power from shaft l0 and drive wheel i2 to shaft 40 and pulley wheel 42. When the rotation of drive shaft 10 and pulley wheel I2 is reversed, that is, turned counterclockwisely, the friction grip of disc l6 against pulley I2 caused by spring 30, will result in disc I6 being swung counter-clockwisely also, until the leading edge I9 of the other wing member 20 is borne against stop 52, tOp'OSitiOniP'the pants as illustrated in- Fig. '2 being the spaced idler-onthe other side of drive wheel 12, with the drive wheel between the idler rollers and the driven pulley 42. The distance between outer rollers. 24, 24 is greater than the diameter of pulley wheel I2, as noted above, and positiofiedrasvthey' areduring counter clockwise rotation-on the si'd'e of pulley wheel [2 remote from driven wheel 42, belt 50 will be lifted thereuponrout of engage ment with and away from the peripheral groove in wheel l2, thereby disengaging the drive pull'ey" and shaft from the driven pulley and shaft.

- I-liaving newdeseribertmy -invention, what. 1 claimand' desire toHsecure by' Letters Patent is 1=. A device ofv the character-described: comm prising a support. memhenra driveshaft and; pulley thereon, ardiscv about the drivesh-af-t and-"associated with -the drive pulley and, capable of rotating therewith, a driven'sha-f-t pulleytherefor onthe-suppont. invspaced relation to the drive-shaft and pul l ey, the-pulleysbeing in! the same plane, idler: rollers mounted on the disc, and spapedrapart thereon a distance; greater than the diameter-of the drive pul1ey-,.- the idler rollers being in. the same plane as-rthe drive and drivenrpulleys an. endless; belt around and; engag ing the drive and driven-pulleys and idler rollers; rotation oi the drive. shaftwahdfdri-ve pulley in one direction rotating the-ascend positioning the idler rollersfbetwen'fthe'drive and driven pulleys, and posit'veIy dfri'vm ,the belt to rotate the driven shattandlpulley andmeans, operableohri tihnof the drive shaft; and pulley in; the opposi I (1 action, to rotate the"di'sc to position the idier .ollers thereon on the side of. the drive pulleyv remote from the driven pulley" to thereby cause "disengagement of" the belt'f'rom the drive 2;, device of the character. describedflcomprijsi'ng a' support, a driv pulley thereon,, a driven pulley thereon, an endless belgt ahout and engagf ing, the driveiand'i driven phileyslia jdisc' associated? with the drive pulley "cfapable "of rotating".

therewith meansonth'e di'sc'ngagihg" the belt: rotationof the drive pulley iri'ondirection rotat= ing the" disc "in the same. direction causing,v a positive driving engagemennter en the drive and driven pulleys,v Mtatidhof the" drive pi'il'l ey in the opposite direction rotatiiigthe' di'sct' in'tlre" opposite direction thereby disengaging the new from ureunwe pulley? r A deviceofthe character described compris= ing; a support memberfai'diit'e' shaft 'and pulley' therepn,;rotatabletherewith in bothdirections; adriven shaft and? pmreyrsereen, rotatable were with in both directions} as eridlessbelt' about and n the same direction;

1 and so positioning the said belt engaging means as to disengage the belt from the drive pulley.

4 l*A'"device of the character described comasupport member, a drive shaft and pull'ey ther'eonjnotatable therewith in both directionsy a "driver-1 pulley, an endless belt about and normally engaging, the drive and driven pulleys, adi'sco'n 'the'dr'ive shaft associated with and capahle'ofi rotating with the drive pulley, a pair of idler rollers on the disc normally engaging the belt; rotation of the dfive sh afit and; pulley in one direction rot tng the disc and driven shaft and pulley in the same direction, the idler rollers isc b in pa ed pa t. ist r r than the; diameter; of the drivepulley, rotation. of, t e drive h ft nd u y he e s te d etiqa m ae e he erm e im ie an di en ing: h b t r r ve l y v 5.; A device as in clairn i, having means on the support to' limit the extent of rotation of the i c a h re t n ,1 A} de'ice s n claim 4,, in which the idler 6 W n 9. PQI I Sf xte ngbeyb'nd 'e periphery 'o'ithe disc,', andstop means" the. disc ml rollers are" mounted are 'o1 1nted; "en the support] against which the: wings abut to limit the extent ofrqtation. of the disc.

T. A deviceof the character described comprising, asupportj, a drive pulley a driven pulley; an endless belt engaging both the pulleya'rota t ion of the drive pulley in one direction actuate rug the e r 'to' rotate the, drivenfpulley in] the same direction, -and means associated with the drive pulleybperable on."initial rotation of the driv pulley in the opposite direction, to disengage re amnraebevia th r ve ey, midi wh r in ea f a di t hei epu r" lev' o rle a i 'm e1' 'a ut' g ha tand eng edfw fl' h dr Yef l ey, tate w r with on rotation of the latter inonedirectiom lidu iimet r em i a iona y witl'i p tdthe drive) pulleyaf rotationof the latter n he pp sited r p i rifi i RO E T E TH- EEERENC S 'P The following. references are of. record in mel ig h s a m v l UNIIHEID" STKHZES PATENTS Liurnber Name Date 268,05; Stevens Nov. 28;, 1882. 367,391; Gauging, u 9} 87,? 

